31115552521661 has 8 divisors (see below), whose sum is σ = 31125325583040. Its totient is φ = 31105780046208.

The previous prime is 31115552521643. The next prime is 31115552521667. The reversal of 31115552521661 is 16612525551113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31115552521661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31115552521667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121828685 + ... + 122083821.

It is an arithmetic number, because the mean of its divisors is an integer number (3890665697880).

Almost surely, 2^{31115552521661} is an apocalyptic number.

It is an amenable number.

31115552521661 is a deficient number, since it is larger than the sum of its proper divisors (9773061379).

31115552521661 is a wasteful number, since it uses less digits than its factorization.

31115552521661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292963.

The product of its digits is 270000, while the sum is 44.

The spelling of 31115552521661 in words is "thirty-one trillion, one hundred fifteen billion, five hundred fifty-two million, five hundred twenty-one thousand, six hundred sixty-one".